EP0437835A1 - Rahmensynchronisierungssystem zwischen mehreren Funkbasisstationen für ein TDMA digitales Mobilkommunikationssystem - Google Patents

Rahmensynchronisierungssystem zwischen mehreren Funkbasisstationen für ein TDMA digitales Mobilkommunikationssystem Download PDF

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Publication number
EP0437835A1
EP0437835A1 EP90125511A EP90125511A EP0437835A1 EP 0437835 A1 EP0437835 A1 EP 0437835A1 EP 90125511 A EP90125511 A EP 90125511A EP 90125511 A EP90125511 A EP 90125511A EP 0437835 A1 EP0437835 A1 EP 0437835A1
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EP
European Patent Office
Prior art keywords
radio base
pulse
reset pulse
base stations
time delay
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90125511A
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English (en)
French (fr)
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EP0437835B1 (de
Inventor
Seiji C/O Nec Corporation Kondo
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NEC Corp
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NEC Corp
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Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of EP0437835A1 publication Critical patent/EP0437835A1/de
Application granted granted Critical
Publication of EP0437835B1 publication Critical patent/EP0437835B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2687—Inter base stations synchronisation
    • H04B7/2696—Over the air autonomous synchronisation, e.g. by monitoring network activity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2684—Synchronisation of a mobile station with more than one base station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation

Definitions

  • the present invention relates to a digital mobile communications system wherein mobile stations and a control station communicate via radio base stations each being located in a particular service area on a TDMA (Time Division Multiple Access) basis. More particularly, the present invention is concerned with a frame synchronization method among the radio base stations.
  • TDMA Time Division Multiple Access
  • a given mobile station moves from a first service area covered by a first radio base station to a second service area covered by a second radio base station, it will communicate with the control station via the second radio base station thereafter.
  • Resetting a plurality of TDMA frame generators simultaneously as mentioned above may be implemented with a satellite which sends a reset signal to the individual radio base stations. Specifically, on receiving the reset signal, each radio base station resets the TDMA frame generator thereof for setting up frame synchronization.
  • a system is large scale and not practical since it needs not only a satellite but also a reset signal transmitter mounted on the satellite and a receiver built in each radio base station for receiving the reset signal from the satellite.
  • a TDMA frame synchronization system among a plurality of radio base stations of the present invention has a single control station governing a plurality of service areas, a plurality radio base stations each being situated in respective one of the service areas and each having a TDMA frame generator, and a plurality of mobile stations each being freely movable from one service station to another and a cable of interchanging digital signals with a particular radio base station situated in the service area where it is located.
  • the system has synchronous signal generating means for transmitting a reset pulse for resetting the TDMA frame generators, and delaying means for delaying the transmitted reset pulse to cause it to reach all the radio base stations subordinate to the control station at the same time.
  • the reset pulse outputted by the delaying means is applied to the TDMA frame generator of each radio base station.
  • the reset pulse is sent every TDMA Frame.
  • the delaying means has returning means for receiving the reset pulse and returning it immediately to the synchronous signal generating means as a return pulse.
  • the synchronous signal generating means has time delay determining means for detecting a time when the return pulse is received and, on the basis of a period of time defined by the time when the reset pulse is transmitted and the time when it is received, determining a set time delay of the delaying means.
  • a TDMA mobile communications system has a single control station 1 which governs a plurality of service areas.
  • the service areas are represented by two service areas 2-a and 2-b for illustration.
  • Radio base stations 3-a and 3-b are situated in the service areas 2-a and 2-b respectively, to cover the associated areas.
  • Communication cables 4-a and 4-b connect respectively the radio base stations 3-a and 3-b to the control station 1.
  • a given mobile station 5 holds a digital mobile communication with the control station 1 via the radio base station residing in the service area in which the mobile station 5 is located, e.g., the radio base station 3-a of the service area 2-a by using an assigned carrier and an assigned time slot.
  • the mobile stations may be a portable type or a vehicle-mounted type.
  • the time delay processor 12 determines a first set time delay (T-t a ) and a second set time delay (T-t b ) associated with the radio base stations 3-a and 3-b, respectively, on the basis of the measured time delays t a and t b .
  • a transmission pulse from the synchronous pulse generator 11, i.e., a pulse sent from the point O is delayed by (T-t a ) at the point A, delayed by (T-t b ) at the point B, and then inputted as a return pulse to the point O, i.e., the time delay processor 12 in the time T.
  • the signal delay circuits 14 each is rendered inoperative as soon as the set time delay is set in the associated time delay adjustment unit 7-a or 7-b.
  • the mobile station 5 When the mobile station 5 is located in the service area 2-a, it holds a communication while setting up frame synchronization with the radio base station 3-a. In this condition, the switching circuit 41 of the control station 1 is connected to the trunk circuit 42. As the mobile station 5 approaches the service area 2-b, its communication is handed over from the service area 2-a to the service area 2-b and the station 5 starts communicating with the radio base station 3-b. At this instant, the switching circuit 41 is caused into connection with the trunk circuit 43.
  • the set time delays need only to be set once before the start of operation of the radio base stations 3 and do not have to be adjusted despite any possible changes in the communication conditions.
  • a counter 75 is reset by the output pulses of the counter 72 and counts time on the basis of the clock fed from the signal generator 71.
  • a latch circuit 76 receives the time counted by the counter 75 and latches it in response to a pulse signal from the buffer circuit 74. The latched time is written to the CPU 44 of the control station 1.
  • the signal generator 71, counter 72 and buffer circuit 73 constitute the synchronous pulse generator 11 while the buffer circuit 74, counter 75 and latch circuit 76 constitute the time delay processor 12.
  • a comparator 87 compares the increasing output of the counter 86 with the constant output of the latch circuit 81 and, when they coincide, produces a pulse
  • the output pulse of the comparator 87 is applied as a reset pulse to the reset input terminal of the flip-flop 84 and the timing pulse generator 56 of the associated radio base station 3.
  • the output pulse or the comparator 87 is fed to the up-link signal delay circuit 14 as a return pulse.
  • the counter 86 When a transmission pulse is applied to the flip-flop 84 of the time delay adjustment unit 7 via the buffer circuit 82, the counter 86 is set and starts counting the clock from the signal generator 85 while inputting the count to the comparator 87.
  • the time delay measured at the time of time delay setting stage is stored in the latch circuit 81 beforehand by, for example, the CPU 55 of the radio base station 7.
  • the comparator 87 compares the value of the latch circuit 81 and that of the counter 86 and, when they coincide, outputs a pulse. This pulse resets the TDMA timing pulse generator 56 of the base station 3 and the counter 86 via the flip-flop 84.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)
EP90125511A 1989-12-27 1990-12-27 Rahmensynchronisierungssystem zwischen mehreren Funkbasisstationen für ein TDMA digitales Mobilkommunikationssystem Expired - Lifetime EP0437835B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP33638089 1989-12-27
JP336380/89 1989-12-27

Publications (2)

Publication Number Publication Date
EP0437835A1 true EP0437835A1 (de) 1991-07-24
EP0437835B1 EP0437835B1 (de) 1995-04-26

Family

ID=18298541

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90125511A Expired - Lifetime EP0437835B1 (de) 1989-12-27 1990-12-27 Rahmensynchronisierungssystem zwischen mehreren Funkbasisstationen für ein TDMA digitales Mobilkommunikationssystem

Country Status (6)

Country Link
US (1) US5293380A (de)
EP (1) EP0437835B1 (de)
AU (1) AU647062B2 (de)
CA (1) CA2033309C (de)
DE (1) DE69018959T2 (de)
HK (1) HK85497A (de)

Cited By (21)

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EP0545311A2 (de) * 1991-11-30 1993-06-09 Nec Corporation Elektronische Schaltung leichtfähig das Bereich einer Funkübertragungszone zu steuern
EP0613276A1 (de) * 1993-02-26 1994-08-31 ORBITEL MOBILE COMMUNICATIONS LIMITED (Reg. no. 2515004) Synchronisationsvorrichtung für eine Vielzahl von Funksendern
WO1994019913A1 (en) * 1993-02-26 1994-09-01 At & T Wireless Communications Products Ltd. Improvements relating to handover in a digital cordless telephone system
EP0626796A1 (de) * 1993-05-28 1994-11-30 Siemens Aktiengesellschaft Verfahren zum Synchronisieren von Basisstationen in einem mehrzellularen, drahtlosen Fernsprechsystem
WO1994028643A1 (en) * 1993-05-27 1994-12-08 Nokia Telecommunications Oy Base station for a tdma cellular radio network
WO1994030024A1 (en) * 1993-06-14 1994-12-22 Telefonaktiebolaget Lm Ericsson Time alignment of transmission in a down-link of a cdma system
EP0671825A1 (de) * 1994-03-09 1995-09-13 Alcatel SEL Aktiengesellschaft Verfahren zur Synchronisation von Impulsrahmen
GB2290926A (en) * 1994-06-30 1996-01-10 Nec Corp Sychronization of base stations in a cellular mobile radio system
WO1997023047A2 (en) * 1995-12-15 1997-06-26 Telefonaktiebolaget Lm Ericsson Discrete phase locked loop
EP0817404A2 (de) * 1996-06-24 1998-01-07 Siemens Aktiengesellschaft Vorrichtung zur Kompensation der Signallaufzeitunterschiede von digitalen Übertragungseinrichtungen
EP0851608A1 (de) 1996-12-31 1998-07-01 TELEFONAKTIEBOLAGET L M ERICSSON (publ) Übertragungszeitverzögerungsmessung bei Übertragungswegen in einem Funk-Telekommunikationssystem
US5787078A (en) * 1994-03-09 1998-07-28 Alcatel N.V. Frame Synchronization method
EP0872972A2 (de) * 1997-04-08 1998-10-21 Siemens Aktiengesellschaft Verfahren und Vorrichtung zum Synchronisieren eines Taktgenerators
WO1998048534A1 (de) * 1997-04-18 1998-10-29 Siemens Aktiengesellschaft Synchronisationsverfahren zwischen basisstationen in einen multicell-system
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WO1998057450A1 (en) * 1997-06-13 1998-12-17 Telefonaktiebolaget Lm Ericsson Methods and arrangements in a radio communications system
EP1061672A2 (de) * 1999-06-12 2000-12-20 Tenovis GmbH & Co. KG Synchronisierung von funkbasisstationen in ein DECT System
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KR101085741B1 (ko) * 2003-12-10 2011-11-21 파나소닉 주식회사 국간전송방법 및 무선기지국 감시방법 및 그 방법을 사용한장치
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Cited By (38)

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Publication number Priority date Publication date Assignee Title
EP0545311A3 (de) * 1991-11-30 1994-03-16 Nec Corp
EP0545311A2 (de) * 1991-11-30 1993-06-09 Nec Corporation Elektronische Schaltung leichtfähig das Bereich einer Funkübertragungszone zu steuern
EP0613276A1 (de) * 1993-02-26 1994-08-31 ORBITEL MOBILE COMMUNICATIONS LIMITED (Reg. no. 2515004) Synchronisationsvorrichtung für eine Vielzahl von Funksendern
WO1994019913A1 (en) * 1993-02-26 1994-09-01 At & T Wireless Communications Products Ltd. Improvements relating to handover in a digital cordless telephone system
WO1994028643A1 (en) * 1993-05-27 1994-12-08 Nokia Telecommunications Oy Base station for a tdma cellular radio network
US5519759A (en) * 1993-05-28 1996-05-21 Siemens Aktiengesellschaft Method for the synchronization of base stations in a multicellular, wireless telephone system
EP0626796A1 (de) * 1993-05-28 1994-11-30 Siemens Aktiengesellschaft Verfahren zum Synchronisieren von Basisstationen in einem mehrzellularen, drahtlosen Fernsprechsystem
WO1994030024A1 (en) * 1993-06-14 1994-12-22 Telefonaktiebolaget Lm Ericsson Time alignment of transmission in a down-link of a cdma system
US5828659A (en) * 1993-06-14 1998-10-27 Telefonaktiebolaget Lm Ericsson Time alignment of transmission in a down-link of CDMA system
EP0671825A1 (de) * 1994-03-09 1995-09-13 Alcatel SEL Aktiengesellschaft Verfahren zur Synchronisation von Impulsrahmen
US5787078A (en) * 1994-03-09 1998-07-28 Alcatel N.V. Frame Synchronization method
GB2290926A (en) * 1994-06-30 1996-01-10 Nec Corp Sychronization of base stations in a cellular mobile radio system
GB2290926B (en) * 1994-06-30 1998-04-08 Nec Corp Inter-station synchronization method
US5722080A (en) * 1994-06-30 1998-02-24 Nec Corporation Inter-station synchronization method
WO1997023047A2 (en) * 1995-12-15 1997-06-26 Telefonaktiebolaget Lm Ericsson Discrete phase locked loop
WO1997023047A3 (en) * 1995-12-15 1997-10-09 Ericsson Telefon Ab L M Discrete phase locked loop
US6081571A (en) * 1995-12-15 2000-06-27 Telefonaktiebolaget Lm Ericsson Discrete phase locked loop
EP0817404A2 (de) * 1996-06-24 1998-01-07 Siemens Aktiengesellschaft Vorrichtung zur Kompensation der Signallaufzeitunterschiede von digitalen Übertragungseinrichtungen
EP0817404A3 (de) * 1996-06-24 2001-09-12 Infineon Technologies AG Vorrichtung zur Kompensation der Signallaufzeitunterschiede von digitalen Übertragungseinrichtungen
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EP0437835B1 (de) 1995-04-26
DE69018959T2 (de) 1995-09-21
DE69018959D1 (de) 1995-06-01
AU6853890A (en) 1991-07-11
US5293380A (en) 1994-03-08
CA2033309C (en) 1998-02-10
CA2033309A1 (en) 1991-06-28
HK85497A (en) 1997-06-27
AU647062B2 (en) 1994-03-17

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